/Engine/Source/Runtime/Engine/Public/CanvasRendererItem.h
Add a new tile to the render data. These tiles all use the same transform and material proxy
int32 AddTile ( float X, float Y, float SizeX, float SizeY, float U, float V, float SizeU, float SizeV, [FHitProxyId](API\Runtime\Engine\FHitProxyId) HitProxyId, [FColor](API\Runtime\Core\Math\FColor) InColor )